The European Central Bank kept its key interest rates at record lows at its policy meeting on Thursday, as calls grew for president Mario Draghi to shed light on his future stimulus plans. 

The ECB's governing council voted, as expected, to keep the benchmark "refi" refinancing rate at an all-time low of zero percent, a spokesman said.

It also held the rate on its marginal lending facility unchanged at 0.25 percent and the rate on the deposit facility steady at minus 0.40 percent -- meaning banks have to pay to park their excess cash with the ECB.