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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b16211ca5e326bd89700600b38e6ee42873cbe6f39bad3253d5944d7b44082d' 
  AND token = 'XImbyCkxiZIHJpNQVxXMpp82V8u0deRe6MxHkW0lP8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}