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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b54bc3428ee380c0fd4b9849480b7f07c30e9420a7212ae0d986a50ad004c7' 
  AND token = 'Gog4Uw+KmhVsNZlYkygAIDxspMkszTzORPx+Tly4IX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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