SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac2d45c3036c69da6f30be2fdfc527fc0ac8db74bd7a1b66c8cb9db671b61d4' 
  AND token = 'vgJUihM4ZhYhH+mKlepptF0ztL3/Ou1I/23BjX181NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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