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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9ab097db416004e6f1dadac193cc2d63709d212071650a98dc3047f5bc041e' 
  AND token = 'PqOGYxJM5gQfa3n8pid2cDoWc9QCI9kBBKixXdO4/zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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