SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0462b93e315815242937e320561d13e72e4b755ff0cc39c746f5a7ca183074' 
  AND token = 'DPG2p+FfJxq6M9bYOeBE2vPRCAnW/Soj+Pgd98sXMWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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