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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90d1244d868a685101c958c7cefaee500f9eb86d818a6ed0401adf5359626ee' 
  AND token = 'zIJGAbTGIU25w2LIpy3mM/5dJvHd1ZFAaogYQa53UyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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