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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23eb4c0dcb6cb18e33b89873827ae1e719fe10d46e1ef3a84237d80800daacd7' 
  AND token = 'D+OE54xp64JFfolrOrV6FzY2v8+Rp8Eqi6g1YTuvfdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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