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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326e4c54fb5cc5b904032b6da15f393f342708cebbc3c62e422317364e07e84a' 
  AND token = 'RvxsbfSnuUtAVYfuBb0yjb86b+yl/jooBRI23Bg8FWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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