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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a3b40efc03a4151fb2b339d7de492f3320f7ab6deee3b0432d2c5d0b7abc4f' 
  AND token = 'QFSMXkz6WnAwUuW+hqkyZh7FYsEx5iknQjH+EdDRShs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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