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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22c79089132706c4e1319f14c767074e8d55778173966646c582d9bde6f253f' 
  AND token = 'KhATcGGpTr8W8m4cldjy4oQVGa0XVgCUSydFpiE9YA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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