Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340fad6c00e6aa6d7a6aa6d0e37802cf2445335cce4f127b976e90ee8e85c801' 
  AND token = 'pjnQFgJrsPrP1BS0BEepsVzCJSH1jUIzlyZ5QoDs3hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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