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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa406331451ab8cd78042fabfb9b9dc257d8b4c4fd395b244fcfcced8797edfb' 
  AND token = 'QoKBqragqP5h44FNMGh9iu287kHUY9m3s0Gee2VEoQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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