SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695153697f062316f5e94c35cb6febb5cf0512d33b5fdf8f4534ede2b6a05a60' 
  AND token = 'jcRErZVP4CvuaXq+xZ7+xwdbrfPhDp2udJ2JjDJpoGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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