SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bad3f0980faf97a944f7e76d57f44c4ff8a8b06d59b92fe9ac0985833247ff0' 
  AND token = 'iZMtXxBXltOqpbob1jF9lgzCiS5b6LmAXquUJOTHYV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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