Bookshelf.js - How to get 'hidden' fields for one query only?

I have the following Bookshelf model :

Bookshelf.model.extend({
  tableName: 'users',
  hidden: ['password']
}, { 
  async getBy(filter) {
    return await this.query({where: filter}).fetch();
  }
})

As you see, the field password is hidden (because I usually don't want it to be shown).
But, I need it to connect my user (when doing the hash comparison) :

const user = await userModel.getBy({email: req.body.email});
if (await bcrypt.compare(req.body.password, user.password)) { 
  // here user.password is undefined because it is hidden
}

Is there a way to shortcut the visibility plugin and get the password without having to do things like directly using knex (Bookshelf.knex.raw()) ?

Best regards,