code: def get(cls, user_id, client_id, token_type='', access_token=None):
          
          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()
docs: 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.