Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50ea2f80a7baf389888315504090f711743dcb515e229508c7b3384da6aeca0' 
  AND token = '9jgOz4omw9Il09hARTj4rdzFyRlhlZcXR4GVz4gAOs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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