No. NFC is completely off unless the device is on and unlocked when it is on consumption is very low.
They actually talked about this at IO as well - breaking down battery drain while the device was on and in use NFC accounted for 0.5% of power consumption (out of 100). Again this is while the device was on. Given that it's disabled when the screen is off you're looking at less than that averaged over regular use of the device.
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