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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9363531df531d9b160ad04e1e59868a71d44d1d666b1f7dd7c1b09d4f92e9c5c' 
  AND token = 'H69Sefd1OYUloo8kkYjXfjY+bAupSAVVNxn5aJjoTmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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