Force branches to build only some, on the web

Build Environment
,
1

Is there a way to force the builds only on certain branches, but in the application, for example, suppose I have the next config.yml:

version: 2
jobs:
  build:
    machine: true
    working_directory: ~/api
    branches:
      only:
        - master
    steps:
      - checkout
      - deploy:
          command: then bash ./bin_deploy/scripts_circle/deploy_production.sh;

My question is how do I protect the deploy to production, if someone changes the code to:

version: 2
jobs:
  build:
    machine: true
    working_directory: ~/api
    branches:
      only:
        - fake_master_merged
    steps:
      - checkout
      - deploy:
          command: then bash ./bin_deploy/scripts_circle/deploy_production.sh;

It will deploy to production, is there a way to force only the master builds in the app, or even to create the environment variables per branch?

Thanks in advance