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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1843b96d44e1b088b64d6379f4d5fb20e6753eb539df8922cdbd70de7980430' 
  AND token = 'GYHsCRbavrrcVBAtlFrSj6ylIjypKgh07Ez3hDnfTY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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