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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a992c4f703bf11c20660b57faeccbd9d1568d4e5e302ab42be234d3d874a037' 
  AND token = 'KAp8dn7CzyxXR3/VnyW8PsmtnMpoUTo+qn5BufjZ0C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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