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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5e02907513b83728ab6ac0cd8357ae82b088a40bbfcfcd5f2bb1fd50ecfb20' 
  AND token = 'Ywy9u/YSJJYu90kDoWg1kGlaNgVs7mLKxMiALeE0k5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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