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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca8172f921b4c105458a20d73673ba1cc5c29acee84f2b3ab29b44735e06062' 
  AND token = 'uKyJxNNVCRbjroiSFKEMCh5BWUMc5Nv/e6YJ7tDXCJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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