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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ecf6c2f96a43a5f0671b9ac72ae0bef17e3a8d0e0680cf688b2e85daac1ef4' 
  AND token = 'oQpT5gO/igBwUSd2wbfjV/uOTGNQ9ckDLcDDVKgkwfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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