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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f69d6b26a47f147d26122d9da02458d0bb6248e53464ac331e46725ea3fa18f' 
  AND token = 'lOhmsI08wINLWDiOeWxBgrj+z4QEh7DeJkCoohnQQnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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