Draw out 2 circles with a dark fill: #555555. One circle being larger than the second. Then add a shape filled with black to connect the 2 circles. See Figure 1.

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Figure 1: Background

Pen Tool

Add 2 anchor points to the shape with your Pen Tool then adjusting the control handles to get a curved shape.

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Figure 2: Background

Copy the shape

Copy (or Clone)the black shape and flip vertically and align it. Now we have the shape of a key hole.

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Figure 3: Background

Union

Select all 4 shapes and go to: Modify> Combine Paths> Union

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Figure 4: Background

Shrink

Shrink to size, add a solid color and inner shaddows like below. Add some button shapes.

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Figure 5: Background

Final Result

Add a bar.

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Figure 6: Background