SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a6009eb540f5da62d4990c2d5b0143504f1e5f106e5943c882f6599976274c' 
  AND token = 'pKlD65vCBQBliw+NpPkW23kK/DE/8d+wtZiCOCVuJW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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