code: def save_token(self, access_token):
          
          access_token_id = self.execute(self.create_access_token_query,
                                         access_token.client_id,
                                         access_token.grant_type,
                                         access_token.token,
                                         access_token.expires_at,
                                         access_token.refresh_token,
                                         access_token.refresh_expires_at,
                                         access_token.user_id)
  
          for key, value in list(access_token.data.items()):
              self.execute(self.create_data_query, key, value,
                           access_token_id)
  
          for scope in access_token.scopes:
              self.execute(self.create_scope_query, scope, access_token_id)
  
          return True
docs: Creates a new entry for an access token in the database.
  
          :param access_token: An instance of
                               :class:`oauth2.datatype.AccessToken`.
  
           :return: `True`.