Get RemoteToken for user.

        :param user_id: The user id.
        :param client_id: The client id.
        :param token_type: The token type. (Default: ``''``)
        :param access_token: If set, will filter also by access token.
            (Default: ``None``)
        :returns: A :class:`invenio_oauthclient.models.RemoteToken` instance.

def get(cls, user_id, client_id, token_type='', access_token=None):
        """Get RemoteToken for user.

        :param user_id: The user id.
        :param client_id: The client id.
        :param token_type: The token type. (Default: ``''``)
        :param access_token: If set, will filter also by access token.
            (Default: ``None``)
        :returns: A :class:`invenio_oauthclient.models.RemoteToken` instance.
        """
        args = [
            RemoteAccount.id == RemoteToken.id_remote_account,
            RemoteAccount.user_id == user_id,
            RemoteAccount.client_id == client_id,
            RemoteToken.token_type == token_type,
        ]

        if access_token:
            args.append(RemoteToken.access_token == access_token)

        return cls.query.options(
            db.joinedload('remote_account')
        ).filter(*args).first()