Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089fd20b6c3da5986b8c7777337fba545ef53a46e9dc0a6f439e491ba6c1497f' 
  AND token = 'Jb+1J5oVa6lw0FcCWa6d4MwUbzdihxLeNMhKJ8hIuXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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