Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad77b19ee73d49e6cfda7f20da578b80f63d416865a7d0e6719abe7948ba232' 
  AND token = '/jwdmyxifiISxhYWZx9zMB7VzppgaImYy9o8IkSjEUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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