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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9627289abfaf731d285e3e452cec19f0f0473161b71499eb7799193d31b53bd7' 
  AND token = '/ytmE1UnsFd4Z7v9gKUCJ9ip6iKlOWCBJaK3YTIwBs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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