SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a123738a1f2521b0460d4a03897124263cfb73b0c386cf00b2da53e5ef8747c' 
  AND token = 'JJp9eVzsvyXzv+L1+98a/LzOYSdHBl9eGJ4JK8KmPLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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