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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d59be1f61f0ee9dae8ae7716ba66c4bfbb0e9692142fed2d8fdbfac33e7db9a' 
  AND token = '6Dp4BsoE4uEoST/P9sk9xWGbkyUOIkumADgYGvOTyQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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