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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431e8e004e63ecb9a4cf8da22333be7f8ede1e4238a5470d012ad309450257ea' 
  AND token = 'AqxnBP7jwOj5rSmKt148VEk3RcVFS8N5OsZtYkgKAkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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