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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e34cb548c3f131e7893682c167c069eadb3f6c9d19a9d834b7a5630ed849ea' 
  AND token = '5jcgK1EypajWXQPI250Culfsuyhhxglsa/l1QpzfPfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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