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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a733fa390ac71d7f3188eb2411853232d54c67a017e75718d2ad98bd2fac16d' 
  AND token = 'mcvXqwyql0wK7yRrxRk77HE4uH8Gj7+FR4KGT55TE7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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