Steps to find contacts that have not been contacted or have no tasks assigned to contact them in the future.
Step #1 - Open a query
Step #2 - Choose Category = System Details
Step #3 - Choose Field = Completed Contact History
Step #4 - Select the Operator = Is Blank
Step #5 - Click the 
button to add a second search criteria
Step #6 - Choose Category = System Details
Step #7 - Choose Field = Open Tasks
Step #8 - Choose the operator = is blank
Step # 9 - Hit Search
Suggestion: Once the search results populate if you wish to confirm the results are accurate select the first contact on the search results by opening in a new tap (top right icon when you scroll your mouse over the contact.) And confirm there is not history or scheduled tasks in the account card. Close the tab and you'll be back at the search results screen.