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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f470810533b6780596ce65e5671047dcd3c3e4d9910a6b1b2836c01362521e6' 
  AND token = 'Z8Ji9RxwRDVARLPeq7vvvz5rq3FWMBug9xTG5uG531U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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