SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcd68ed3b7699d48569ba95c05352a156017ffd6968e309f615c408824aa2ad' 
  AND token = 'J5tpUKdey3PHvC/QTBDQeyu3JVlETs2DZXK4j/vJ4ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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