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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4e9cc68dbc84f1c5f5afacbc066c025e3e8f02a67732c40fc080a5a29c01c7' 
  AND token = 'Eup39uI4N4lnEuuQ2lDtST4oOsynTcmAFm/WKQs4Qt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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