Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb732ad41e5561a5c138b6a557800ba225566f1ea36a23ae0587dcb66401855' 
  AND token = '+JYcRmFimpNb3SSVBQahUlkevTUjicXZOXinq3lSXaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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