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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42384652ec1cffeb956b7aa7533eae78e334e17d88a3b39a6b9b8719df8bce0' 
  AND token = 'WDBzo6f9jbSublyzZdyzTfp4kT7RtPP49h6/euEU5WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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