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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4997614cd2db614e403c3801ed9aba983b89f87820564fd6884ab93c64f935d6' 
  AND token = 'c7t1I3C57WXLu+pFoD4CJD6pibotaWlqGkXvkmhFFas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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