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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aab6c4e5b4951e3c63aa1f8143fb56fc80f38b352f6822bfb34352a8df739e' 
  AND token = '0DhIU4/aJ0Gqs/c7fI3DhAWzNuNZgmznme7UGIE1BRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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