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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d0a00d750c81272a34843c8a336d0a3a3808b64bd8fee604bf11a5716ee1aa' 
  AND token = 'JFi8G+5ebbK+deUAnY5tZ2+THqhu4JCyxlQ6EDN5lqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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