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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afba0f34cd78ea2bb24bcf6c15e79f57a3ca86ac6cbfd5e89d4a5a8704c745c' 
  AND token = 'ILCDOD/9pKBguylSsvZ//I0ap0QX7Pifn9eGwrkfHZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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