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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82fa574c6967aebb353a648682d3cbae56988efcbc12717b7f47c369add15fc' 
  AND token = 'EuQq4pEdnp/6awjY+QQ/yso0yEQgxcoZL7bErLBHt7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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