SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc42a92e454ddd87a6d7edb32654cce574d4a8323b90ee8c6b864092a09a956b' 
  AND token = 'UbK/YU1G5w8ZpnzYgsniE47XM/84fjJAmdkW+tlg5zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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