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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60e8acc8f46b838ca1ba364e867c7ed0b056d7a75bb3efb3a43b9713b27e25c' 
  AND token = 'y5cVnqQDbHPi1f9Mw6WXIEJEm6hhgfEkWNkEZU2Koyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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