public function associateScope($accessTokenId, $scopeId)
    {
        DB::table('oauth_session_token_scopes')->insert(array(
            'session_access_token_id' => $accessTokenId,
            'scope_id'                => $scopeId,
            'created_at' => Carbon::now(),
            'updated_at' => Carbon::now()
        ));
    }