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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1d3be34adb7343f751f8268bbc5bbbc481548f3b7fecb4fe8b595ad7ba215b' 
  AND token = 'duFB4d4ATnAaTSyOiZPu9lUzXi8+DEhPFJNv/3lHQjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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