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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402cd538569f4d079793eaac4e79a9f53faa2ce749d94edaad36d23be5875518' 
  AND token = 'qUazM3XhH439FM3IQUKeUyc+o8q8RdUDqIxEyaH1wjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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