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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f086d49fbc14947c48e5bb628c66eadbf8426d21e42728d2bf2ee0aa4086f8ca' 
  AND token = 'Yfei/RTHJmuLz78onJHq0Ie6AU1gr95QpYNshmQb6aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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