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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91b808633e2205c8169f6624544249489f422d6eb5f20e62eae49482580c589' 
  AND token = 'IUDFt/Z+h6le5nZEMQLAFdOGkr2axbDYcOo5I4V6/xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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