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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd170cd93865809f2c3cf354179f7d1f529681b21cd872004a8b52df44d93ca' 
  AND token = 'tw7102ZmZ4RP1uoojBbHRpD3V3wLyIuHzvCv0ZDP5fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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