SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dad5d9a2bcd31574f7cbb25307b1eb34a090fcd4efebc86826798d41a18644' 
  AND token = 'F9RdrCh/+YH3Y0/xzJY2QTIQiNOFgptriV6jT+sqIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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