SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'gift_certificate', 'free_products', 
    'quick_view', 'gift_certificate', 
    'edit', 'gift_certificate', 'gift_cert_to', 
    'gift_cert_from', 'amount', 'send_via', 
    'postal_mail', 'free_products', 
    'product', 'price', 'quantity', 'subtotal', 
    'price_summary', 'gift_certificate', 
    'free_products', 'quick_view', 'gift_certificate', 
    'edit', 'gift_certificate', 'gift_cert_to', 
    'gift_cert_from', 'amount', 'send_via', 
    'postal_mail', 'free_products', 
    'product', 'price', 'quantity', 'subtotal', 
    'price_summary'
  )

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "33.61"
    },
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "lang_code",
        "name"
      ],
      "key_length": "392",
      "rows_examined_per_scan": 14,
      "rows_produced_per_join": 14,
      "filtered": "100.00",
      "index_condition": "((`satishecarter_dec_setup_001`.`lang`.`lang_code` = 'en') and (`satishecarter_dec_setup_001`.`lang`.`name` in ('gift_certificate','free_products','quick_view','gift_certificate','edit','gift_certificate','gift_cert_to','gift_cert_from','amount','send_via','postal_mail','free_products','product','price','quantity','subtotal','price_summary','gift_certificate','free_products','quick_view','gift_certificate','edit','gift_certificate','gift_cert_to','gift_cert_from','amount','send_via','postal_mail','free_products','product','price','quantity','subtotal','price_summary')))",
      "cost_info": {
        "read_cost": "30.81",
        "eval_cost": "2.80",
        "prefix_cost": "33.61",
        "data_read_per_join": "5K"
      },
      "used_columns": [
        "lang_code",
        "name",
        "value"
      ]
    }
  }
}