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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06818b61e4d2f1fd9f85c4ee3f8cc85de229be02f0e6ccaa0fe55eb287f4c1dd' 
  AND token = 'qclNRGthMw/BIDF76rX0A39GhTaksjf7Ner4uDSugJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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