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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bb4fe985f6c396c8068353b354d8fb06723919f3e810fc820346adf6fd9dd9' 
  AND token = 'u/cExaQw5osQdoCl7z7A7O29W70CAasJXgWdCnLXm38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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