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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5723fc0fb313101e53436cae08764c921db2ca164586d1ac2e122f6206fe75' 
  AND token = 'iAbu0oy82SkLC3h+iUo0LSKND4fw2EJzcBT/dtr1wpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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