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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ab9d22e9f3d348be5d47938eb1c6e6c4a15041d0a5ca4f330cfdd10139f220' 
  AND token = 'R5s24rpJYh2cGaUuDIB1eaXJ1CJ54Q9yxFci41MjPoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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