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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338c62819b579780f92c9c7f10e833b70993963e890abda74e5b6cf1a871f8e4' 
  AND token = 'JrFDEh4CuqEAdH6DmKYNntpGCts/NSIsmMv9TIND8bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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