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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595645a064a84b1205fdb9737050a359df4a72ddc36d57a734e8dad877ab7cc2' 
  AND token = 'bkHDoSWGTbXq3oNSmYJd4PCAdXnzwi+9xpICAO4YBMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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