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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e02f661a42163e291aa078167873a73326793e3c3d2ea9dab3c42b98c1877f' 
  AND token = 'bKZNQv32JL02wS5G05s8+EOvEPA/p10qGnBFqiQ1guY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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