SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17647fd5493077ae5ebc01bbf90ac413b5bed2b6506e82d84ef0076232141a1a' 
  AND token = 'ogWm2jztVGRxWBOO8clEohZjgJup4ucA+WP0vQFqeN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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