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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da723d2cdcbb05bf3a5e97e73e9ba5f77365c6e9c960a5cedcdc4c3da28513f5' 
  AND token = 'kHtc//ukHUh3xoMI0ykxpRa4rXuhSP5EFQqdfuscDUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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