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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346c48e7bdad81c67c93647473d52b834eb8dfad0b955f3ec6ab37be1bb558d9' 
  AND token = 'lON8/vh8fOkQXliCy1JYihck/D7W48pBhW+otMwr3iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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