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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3691e767ff36246ffb46b43da264a2e2a8c4ce383c631edcec6eb6185e9f1406' 
  AND token = 'LpPvTIMmpPKkptae6vE9kMExFpW0wj+jNpR9GoCl6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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