Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30338bf6a119748137d1158b04eed67403b7d816f068e6f35dd634ca5f32c15' 
  AND token = 'UK2yrVyb8BrPzmgojdF7aQST9B7bguGQuztUH45nPxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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