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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734ea6b19d6e7db6abbf2ea97e2b5459def16340332c6f2db6f21e423a930fa0' 
  AND token = '9hFJvmRqMW6bxJLUiPad5ZAYf2HwBy1OqFEu8+88wUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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