SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec052ab75754cf041268424a7f437591b44352bc81727040e860f4d1064a94f' 
  AND token = 'zGrqbQyg9YNiPU6YIcszLCvtZxvxiWOIAz9Bj6UD6S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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