SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd599e6af966000b0408a8e2469e625f249d5a5e24ed2698e13f7068b350132bf' 
  AND token = 'zZiVqdiWq5/yrjsWJuB1eodOJKmZHB/qb7VCBI8hQ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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