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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bfc94fbe5af25e3f7116fb282c230f04e48d2db1d2a05d8a51005d89a8f3ec' 
  AND token = 'Zo427YeDLV0oWrbsX0DVqF0mub6bmcURr2CDOHqlOag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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