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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59cb8e2770cdfec0d5bcf75bc7e9bcb8251a8e3723c1f831b8e9548baafe1e9c' 
  AND token = 'xslz5Kt4nZRHgjlguNdayeJfjvmigX0lMgZ9NUSRcVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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