SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6beaa9f452d624f35cd0e62ff552f6151d5537668524ab643d202730a7963e3' 
  AND token = 'xPiFm9ZUtaG02u4n5BV/qYqOpZSXwxCi1rxGz+/ihOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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