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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f858d415d25ae8f734f154ffd205e2931dc09e0b1ee551e86de463391ff6d366' 
  AND token = 'Ji3+hR9gbKe0nX8KIolB1ogFf6jgx1fnnBYJPXz/PQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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