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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b59f875de532320d4a917a583b2da0cb0e8288c585031c7ab0077de15573824' 
  AND token = 'b6hPGGe/jezdf7IuLFKnJlg/ufmIg+yX7tLLjRGstlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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