SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b1164b32f68d56bc6b7f6df643249b5d361071d91ef5872c48cc949c3878be' 
  AND token = 'Zl1bq5vSzhIYm+vlO5ZIV4mwniDZkhQVCKARUhxaQfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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