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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213b36b8c1bcc3e2411103f13101c1d2cc038905a3688e0de6e4cad1587addce' 
  AND token = 'jbtbkF+ZovATfZbwhzYlDpDoPuQiF5b5K02WRn55NCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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