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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c524a5d02bbe8f76d4560425e091afd189348390baff2650e7cbe655d79a3e9' 
  AND token = 'mKZxby9R42Aynwa6+GkfKFhv7O2v2tE71s6L1pwiMT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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