Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f846cdb000c19566a049e9971751b6a196b40659c8c6071f082436a5a200651' 
  AND token = 'PXQYg3jwYRNQqW4xT9YyEjwFqroSTsBC8VpRoRYNjwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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