SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfa4be3df1782e585f79455ed09a57ece44e6d526432ac55431f4c008d30e78' 
  AND token = 'gJ6Y5nsiEP5a+eHzU3/+cTqfkGu7KwfwMhCmVGMxduI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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