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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620af07a4c4c6fdee21620381e79405aa6fe11a6c318845647e37f7ddd028667' 
  AND token = 'PppezO39SZe4x7qxohvT95LxtChHpxz0gst3WoJ5xjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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