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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcd66200695511ab8c1de074f262f8458dcc17b2e5fd387038c59914ad1c00a' 
  AND token = '1RVxVEzxysRMzs5gCi0NekISDSDmwiRof/SMpMUAAms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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