code: @View(name = "by_token", map = "function(doc) { if(doc.token && doc.userId) { emit(doc.token, doc) } }")
      public List<CouchDbGoogleAuthenticatorToken> findByToken(final Integer otp) {
          return queryView("by_token", otp);
      }
docs: Find by token.
  
  @param otp token to search for
  @return token for the otp