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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f0ea3d2b83d9118ef382e54d9167dc5cb470531f961d676df878ccfe922dec' 
  AND token = 'YHPnBGddsW+j6Szxy+H67LUAqqT0aiVtiC7W8XbN0A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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