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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b71216513c7885c1ad010bc8cd30eaafdc568784d6fc20cb70e77e8456f002' 
  AND token = '0tTFy7Ckn7J2RwrckkGi0Eth3Ovkzvi7mJqJv/q0XsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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