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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bdf77087332a9840641f84eecdfe7980b6f69052ecd41e4a56f9c98096922d' 
  AND token = '44vQHT+HSq8Ro3remxWFvvBzLS/au4PbcaRH6U2opo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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