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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbe5b0194420db80be36a3bb1a55db61b081eb5351cf857f18cff044f7e4586' 
  AND token = 'gL/lv8KlWHJiL3FC9EaB5Fn2ZBnRK6/r3vn8vfa5k6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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