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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb8ef913eb16d05f963a8e856d4931be113f50b2b259acd4c7456bbe6a6f65c' 
  AND token = 'wvfBs1dDgQQ1bnvJ3GJVOxJblG7i11ac+uO6h2MYxhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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