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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f363c4e6064219abbaa7040440b258b1b5ccc94bfaf79ca7e4f3395c648f53d' 
  AND token = '3yYkHlYn3iEJtew5vHnT5LTGtTC3ZBmb+pVb31gLrqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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