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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613d4b157d9cd338ffc610468c61a90ae665098b75b28a970eb8320a350fb6e5' 
  AND token = 'O3EkKGkB36a3YZ5mvqQne6Z6QfudQCaPVW+/qurr5bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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