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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327fe00b3d93fae8763dbcc8278ecae31dd2f7e5183a8293dc453ec750f297f4' 
  AND token = 'AHh6rK7cMrerrYVU4OG9Np5bnpHVaVvVprqztNL/csY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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