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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7857f31e350390de137119071e70d140539dd2521f41285f72cbfccd792f7d98' 
  AND token = 'gz52+HtkAgI0xgePw0aigWNU6RtcqrUwloAsID5nGgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}