dict_list_condition.yml

- name: Vars iteration
  hosts: all
  vars:
    users:
      user1:
        name: user1
        key:  ssh-key
      user2:
        name: user2
        key:  ssh-key2
    user:
    - user1
  tasks:
  - name: Iterate user
    debug:
      msg: "{{ item }}"
    with_items:
    - user
  - name: Iterate users
    debug:
      msg: "{{ item.value.name }}"
    with_dict: "{{ users }}"
  - name: Iterate user over users
    debug:
      msg: "{{ item.value.name }} - {{ item.value.key }}"
    with_dict: "{{ users }}"
    when: item.key in user