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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a813220958c3104d14182a892227a29db7d8c9528c2f7c14e88ff6f6ed9822b1' 
  AND token = '3T6SbvoOUo1n1yQk8OhxQ3NYV0yw+1Cc0sW+/xnAKh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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