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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5926911663977183136851906407e4f07c6de0ac29e1e2f4402d02e4c6278d7f' 
  AND token = '0rYnFkLIcKZBvhCShc8iuB+81/3DNBeEE+EZ+srgSuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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