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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89a9383e36f3148930f6954fdbf409e95183944576974004efe90663b5e8c40' 
  AND token = 'X0Jpy6BwkpsA+2S/mzwEWTfBeCjMnzRF9jTUZ2wZ1UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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