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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2df32e3568588f8c3f912055aa15e06d1cb16d4e98a92a34db0d17b0c33bb8a' 
  AND token = 'mNL5fvKc2K3w4zhZjnzYbHsrzsfbyytVZ+pa8t34usM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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