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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46204d1413b47d37307b4845f11c07059c07d4796471dd83a7c7141680673a39' 
  AND token = 'EwJHz3e5K7UnLPaQpo7IWyx7oDZlUh5P5SFzrTxx6Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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