SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07197c53dfc8f20cef527757ba3b689ac9c16a1604fc2e0266c90bda8e40feae' 
  AND token = '9+JnGnvMKqnBnFT4kzVH41EOWf5vuYHA/7hYTQq1IDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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